In 1891, Gundlach offered six field-type lens formulae, five of which were rapid rectilinear types and one single achromatic type. They were the: Gundlach Rapid Rectilinear Lens, Gundlach Perigraphic Lens, Gundlach Wide Angle Lens, Gundlach Star Lens, Gundlach Star Wide Angle Lens and Gundlach Single Achromatic Lens.
References:
The International Annual Anthony's Photographic Bulletin, Vol. I,
1889, W. J. Harrison
and A. H. Elliot, eds., E. & H. T. Anthony & Co. (New York, NY), ads
p. 37
Illustrated Catalogue of Photographic Lenses, Sixth Edition,
Gundlach Optical Co., (Rochester, NY), dated June 1891, p. 13